<template>
	<view class="container">
		<!-- 空白页 -->
		<view v-if="!hasLogin || empty===true" class="empty">
			<image src="/static/emptyCart.jpg" mode="aspectFit"></image>
			<view v-if="hasLogin" class="empty-tips">
				空空如也
				<view class="navigator" v-if="hasLogin" @click="jump">随便逛逛>
				</view>
			</view>
			<view v-else class="empty-tips">
				空空如也
				<view class="navigator" @click="navToLogin">去登陆></view>
			</view>
		</view>
		<view v-else class="listData">
			<view class="searchData">
				<u-search placeholder="请输入" v-model="par.name" shape="round" @search="searchData"
					@custom="searchData"></u-search>
			</view>
			<!-- 列表 -->
			<view class="cart-list">
				<scroll-view scroll-y="true" style="height: 100vh;" refresher-background="#FFF"
					@scrolltolower="loadMore">
					<view v-for="(item, index) in cartList" :key="item.id">
						<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">
							<view class="image-wrapper">
								<img :src="item.photo" alt="" />
								<view class="yticon icon-xuanzhong2 checkbox" :class="{checked: item.checked}"
									@click="check('item', index)"></view>
							</view>
							<view class="item-right">
								<text class="clamp title">{{item.name}}</text>
								<text class="attr">{{item.attr_val}}</text>
								<text class="price">¥{{item.sellingPrice}}</text>
								<uni-number-box class="step" v-model="item.num" :index="index" :min="1"
									@eventChange="numberChange"></uni-number-box>
							</view>
							<text class="del-btn yticon icon-fork" @click="deleteCartItem(index,item.id)"></text>
						</view>
					</view>
				</scroll-view>
			</view>
			<!-- 底部菜单栏 -->
			<view class="action-section">
				<view class="checkbox">
					<image :src="allChecked?'/static/selected.png':'/static/select.png'" mode="aspectFit"
						@click="check('all')"></image>
					<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">
						清空
					</view>
				</view>
				<view class="total-box">
					<text class="price">¥{{total}}</text>
				</view>
				<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
			</view>
		</view>
	</view>
</template>

<script>
	import {
		shoppingTrolleyList,
		shoppingTrolleyDelete,
		shoppingTrolleyNum
	} from '@/api/cart.js'
	import {
		mapState,
		mapMutations
	} from 'vuex';
	import uniNumberBox from '@/components/uni-number-box.vue'
	export default {
		components: {
			uniNumberBox
		},
		data() {
			return {
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [],
				par: {
					pageNum: 1,
					pageSize: 10,
					name: ''
				}
			};
		},
		onLoad() {

		},
		onShow() {
			this.loadData();
		},
		watch: {
			//显示空白页
			cartList(e) {
				let empty = e.length === 0 ? true : false;
				if (this.empty !== empty) {
					this.empty = empty;
				}
			}
		},
		computed: {
			...mapState(['hasLogin'])
		},
		methods: {
			...mapMutations(['settabbarValue']),
			// 跳转到首页
			jump() {
				this.settabbarValue('/pages/index/index')
				uni.switchTab({
					url: '/pages/index/index'
				})
			},
			// 搜索
			searchData() {
				this.loadData()
			},
			// 下拉加载
			loadMore() {
				this.par.pageSize = this.par.pageSize + 5
				this.loadData()
			},
			//请求数据
			async loadData() {
				let res = await shoppingTrolleyList(this.par)
				if (res.code == 200) {
					console.log(res);
					let cartList = res.data.records.map(item => {
						item.checked = true;
						return item;
					});
					this.cartList = cartList;
					this.calcTotal(); //计算总价
				}

			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/errorImage.jpg';
			},
			navToLogin() {
				uni.navigateTo({
					url: '/pages/public/login'
				})
			},
			//选中状态处理
			check(type, index) {
				if (type === 'item') {
					this.cartList[index].checked = !this.cartList[index].checked;
				} else {
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item => {
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			//数量
			async numberChange(data) {
				let par = {
					commodityId: this.cartList[data.index].commodityId,
					num: data.number
				}
				let res = await shoppingTrolleyNum(par)
				if (res.code == 200) {
					console.log(res);
					this.loadData()
					this.calcTotal();
				}
			},
			//删除
			async deleteCartItem(index, itemId) {
				let par = {
					commodityId: [itemId]
				}
				let res = await shoppingTrolleyDelete(par)
				if (res.code == 200) {
					this.calcTotal();
					this.loadData()
					uni.hideLoading();
				}
			},
			//清空
			clearCart() {
				uni.showModal({
					content: '清空购物车？',
					success: async (e) => {
						if (e.confirm) {
							let par = []
							this.cartList.forEach(res => {
								par.push(res.id)
							})
							let res = await shoppingTrolleyDelete({
								commodityId: par
							})
							if (res.code == 200) {
								this.loadData()
								this.calcTotal();
								uni.hideLoading();
							}
						}
					}
				})
			},
			//计算总价
			calcTotal() {
				let list = this.cartList;
				if (list.length === 0) {
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item => {
					if (item.checked == true) {
						total += item.sellingPrice * item.num;
					} else if (checked == true) {
						checked = false;
					}
				})

				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			//创建订单
			createOrder() {
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item => {
					if (item.checked) {
						goodsData.push({
							attr_val: item.attr_val,
							number: item.number
						})
					}
				})

				uni.navigateTo({
					url: `/pages/order/createOrder?data=${JSON.stringify({
						goodsData: goodsData
					})}`
				})
				this.$api.msg('跳转下一页 sendData');
			}
		}
	}
</script>

<style lang='scss' scoped>
	.container {
		padding-bottom: 134upx;

		/* 空白页 */
		.empty {
			position: fixed;
			left: 0;
			top: 0;
			width: 100%;
			height: 100vh;
			padding-bottom: 100upx;
			display: flex;
			justify-content: center;
			flex-direction: column;
			align-items: center;
			background: #fff;

			image {
				width: 240upx;
				height: 160upx;
				margin-bottom: 30upx;
			}

			.empty-tips {
				display: flex;
				font-size: $font-sm+2upx;
				color: $font-color-disabled;

				.navigator {
					color: $uni-color-primary;
					margin-left: 16upx;
				}
			}
		}
	}

	.listData {
		width: 100%;
		position: relative;

		.cart-list {
			margin-top: 80rpx;
		}

		/* 购物车列表项 */
		.cart-item {
			display: flex;
			position: relative;
			padding: 30upx 40upx;

			.image-wrapper {
				width: 230upx;
				height: 230upx;
				flex-shrink: 0;
				position: relative;

				img {
					width: 100%;
					height: 100%;
					border-radius: 8upx;
				}
			}

			.checkbox {
				position: absolute;
				left: -16upx;
				top: -16upx;
				z-index: 8;
				font-size: 44upx;
				line-height: 1;
				padding: 4upx;
				color: $font-color-disabled;
				background: #fff;
				border-radius: 50px;
			}

			.item-right {
				display: flex;
				flex-direction: column;
				flex: 1;
				overflow: hidden;
				position: relative;
				padding-left: 30upx;

				.title,
				.price {
					font-size: $font-base + 2upx;
					color: $font-color-dark;
					height: 40upx;
					line-height: 40upx;
				}

				.attr {
					font-size: $font-sm + 2upx;
					color: $font-color-light;
					height: 50upx;
					line-height: 50upx;
				}

				.price {
					height: 50upx;
					line-height: 50upx;
				}
			}

			.del-btn {
				padding: 4upx 10upx;
				font-size: 34upx;
				height: 50upx;
				color: $font-color-light;
			}
		}

		.searchData {
			background-color: #fff;
			width: 100%;
			position: fixed;
			top: 0;
			padding: 0 40rpx;
			z-index: 99;
		}
	}



	/* 底部栏 */
	.action-section {
		/* #ifdef H5 */
		margin-bottom: 100upx;
		/* #endif */
		position: fixed;
		left: 30upx;
		bottom: 30upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690upx;
		height: 100upx;
		padding: 0 30upx;
		background: rgba(255, 255, 255, .9);
		box-shadow: 0 0 20upx 0 rgba(0, 0, 0, .5);
		border-radius: 16upx;

		.checkbox {
			height: 52upx;
			position: relative;

			image {
				width: 52upx;
				height: 100%;
				position: relative;
				z-index: 5;
			}
		}

		.clear-btn {
			position: absolute;
			left: 26upx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 38upx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius: 0 50px 50px 0;
			opacity: 0;
			transition: .2s;

			&.show {
				opacity: 1;
				width: 120upx;
			}
		}

		.total-box {
			flex: 1;
			display: flex;
			flex-direction: column;
			text-align: right;
			padding-right: 40upx;

			.price {
				font-size: $font-lg;
				color: $font-color-dark;
			}

			.coupon {
				font-size: $font-sm;
				color: $font-color-light;

				text {
					color: $font-color-dark;
				}
			}
		}

		.confirm-btn {
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $font-base + 2upx;
			background: $uni-color-primary;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}

	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked {
		color: $uni-color-primary;
	}
</style>